2.
-A cook is someone WHO cooks food
-The man, WHOSE dog is a big labrador...
-Saturday was the day WHEN i lost my phone...
-This is the pencil WHICH i use for...
3.
-in
-on
(W tym z odmienianiem na strone bierną ci nie pomoge, sorry luv)
5.
-Cannot, can’t (jedno i to samo)
-Whose
6.
-off
I hope i helped xx